O₂
Oxygen is a vital chemical element with the symbol O and atomic number 8. It is a colorless, odorless, and tasteless gas at room temperature, and it makes up about 21% of Earth's atmosphere.
Oxygen is a vital chemical element with the symbol O and atomic number 8. It is a colorless, odorless, and tasteless gas at room temperature, and it makes up about 21% of Earth's atmosphere.